What’s the best way to clean synthetic rattan garden furniture?

The best way to clean rattan furniture is to use a jet washer. This will get all of the stains out of the weave and remove the small bits that get stuck in between the strands.

This is only advised however if you have weatherproof rattan furniture, as this variety can get wet without rusting. If you have a cheaper set of rattan, made from a steel frame, then you may be better to use a hoover to remove the small bits, and to use a warm damp cloth with some soapy water to remove the stains.